Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà :
http://www.aaa.org/m20/
Äàòà èçìåíåíèÿ: Unknown
Äàòà èíäåêñèðîâàíèÿ: Sun Apr 10 03:17:52 2016
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Amateur Astronomers Association of New York
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m20
Published
February 16, 2015
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M20, Trifid Nebula